Use dataSnapshot variable

Question

DatabaseReference nume_sofer = database.getReference("Rute").child("1").child("Sofer");

    nume_sofer.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            String sofer_nume = dataSnapshot.getValue(String.class);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });

    assert user != null;
    if(Objects.equals(user.getDisplayName(), sofer_nume)) {

Sorry, is it possible to use the variable sofer_nume from onDataChange in the if statement ? Thank you!

Please check the duplicate to see why your `sofer_nume` is `null` outside the callback and how can you solve it using a custom callback. — Alex Mamo, Feb 17 '19 at 07:55

Geeky Omar · Answer 1 · 2019-02-16T20:00:52.267

1

You can declare it outside the listener's scope then initialize it inside it so you could use it down in the if statement

Edit : check this

DatabaseReference nume_sofer = database.getReference("Rute").child("1").child("Sofer");    
String sofer_nume = null;

    nume_sofer.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            sofer_nume = dataSnapshot.getValue(String.class);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });

    assert user != null;
    if(Objects.equals(user.getDisplayName(), sofer_nume)) {

edited Feb 16 '19 at 20:00

answered Feb 16 '19 at 19:40

Geeky Omar

44
9

I tried it, but the result is null – simpller Feb 16 '19 at 19:46
Check my edited code please – Geeky Omar Feb 16 '19 at 20:01
I edited the question by adding another picture, check it please – simpller Feb 16 '19 at 20:09
also I made it global, but sofer_nume is again null – simpller Feb 16 '19 at 20:14

Use dataSnapshot variable

1 Answers1